(395c) The Ideal Gas Contribution to Liquid Heat Capacity

Liquid heat capacity (LCP) can be thermodynamically described as the sum of the ideal gas heat capacity (ICP) and residual heat capacity. To examine the contribution of ICP to LCP, the DIPPR database was searched for all experimental liquid heat capacity data points. For each of these points, the corresponding ideal gas heat capacity was calculated using the accepted ICP correlation at the experimental temperature. The resulting test set for this work contained approximately 1100 unique compounds. Chemical family studies were performed to show the relationship between ICP and LCP. The results of these studies will be a useful tool as quality checks in the DIPPR compound evaluation process. The ICP-LCP relationship may also serve as a basis for the creation of future LCP prediction methods for a wide range of chemical families.